{}

Our Brands

Impact-Company-Logo-English Black-01-177x54

Welcome to the Schneider Electric Website

Welcome to our website.

Search FAQs

Is it OK to put a disconnect between a VFD drive and the motor?

Issue:
Disconnect on the output of a drive?

Product Line:
All open style and enclosed Altivar drives.

Environment:
All models, all Serial numbers

Cause:
Information not available in existing literature.

Resolution:
A disconnect can be used between the drive and the motor. This is general practice to assure that power does not reach the motor during maintenance and other non-operating times.
Note that the disconnect should not be opened or closed while the VFD is running (outputting voltage from T1,T2,T3). This is sometimes referred to as "slamming the motor." This can damage the output IGBT components of the drive and such damage is not covered under warranty.
We recommend adding a fast-acting auxiliary contact on the disconnect that will trigger a freewheel stop on the drive before the main 3 phase contacts open.
Refer to your drive's Programming Manual for instructions on programming a logic/digital input as freewheel stop.

Schneider Electric Canada

Explore more
Range:
Altivar 12Altivar 71Altivar 61Altivar 212Altivar Process ATV600
Explore more
Range:
Altivar 12Altivar 71Altivar 61Altivar 212Altivar Process ATV600
Users group

Discuss this topic with experts

Visit our Community for first-hand insights from experts and peers on this topic and more.